install TA-lib in Dockerfile

Dockerfile

@@ -1,5 +1,14 @@
 FROM    python:3.6.2
 
+RUN pip install numpy
+RUN apt-get update
+RUN apt-get -y install build-essential  
+RUN  wget http://prdownloads.sourceforge.net/ta-lib/ta-lib-0.4.0-src.tar.gz
+RUN tar zxvf ta-lib-0.4.0-src.tar.gz
+RUN cd ta-lib && ./configure && make && make install
+RUN pip install TA-Lib
+ENV LD_LIBRARY_PATH /usr/local/lib
+
 RUN     mkdir -p /freqtrade
 WORKDIR /freqtrade